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-186+3x=-12x+99
We move all terms to the left:
-186+3x-(-12x+99)=0
We get rid of parentheses
3x+12x-99-186=0
We add all the numbers together, and all the variables
15x-285=0
We move all terms containing x to the left, all other terms to the right
15x=285
x=285/15
x=19
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